1.0.7

• Support mixing shorthand and non-shorthand format args (#47)

  #[derive(Error, Debug)]
  pub enum Error {
      #[error("first letter must be lowercase but was {:?}", first_char(.0))]
      WrongCase(String),
      #[error("invalid index {idx}, expected at least {} and at most {}", .limits.lo, .limits.hi)]
      OutOfBounds { idx: usize, limits: Limits },
  }

• Add #[error(transparent)] attribute for delegating Error impl to one field (#50)

  This is useful for hiding error variants from a library's public error type:

  #[derive(Error, Debug)]
  #[error(transparent)]  // source and Display delegate to ErrorKind
  pub struct Error(ErrorKind);
  
  #[derive(Error, Debug)]
  /*private*/ enum ErrorKind {
      #[error("...")]
      E0,
      #[error("...")]
      E1(#[source] io::Error),
  }

  And also for enums that need an "anything else" variant; such variants tend not to have their own Display message but just forward through to the underlying error's Display and source:

  #[derive(Error, Debug)]
  pub enum MyError {
      ...
  
      #[error(transparent)]
      Other(#[from] anyhow::Error),  // source and Display delegate to anyhow::Error
  }